{"orbit":{"orbit_id":"K233/5","last_obs":"2025-04-28","source":"JPL","two_body":null,"equinox":"J2000","first_obs":"2008-05-05","elements":[{"sigma":"1.9e-08","value":"0.694","units":null,"name":"e","label":"e","title":"eccentricity"},{"title":"semi-major axis","label":"a","units":"au","name":"a","value":"3.48","sigma":"2.1e-07"},{"value":"1.06","sigma":"3.8e-08","title":"perihelion distance","label":"q","name":"q","units":"au"},{"label":"i","title":"inclination; angle with respect to x-y ecliptic plane","name":"i","units":"deg","value":"13.6","sigma":"2e-06"},{"sigma":"9.2e-06","value":"220","label":"node","title":"longitude of the ascending node","units":"deg","name":"om"},{"sigma":"9.6e-06","value":"181","label":"peri","title":"argument of perihelion","name":"w","units":"deg"},{"sigma":"2.3e-05","value":"252","title":"mean anomaly","label":"M","name":"ma","units":"deg"},{"value":"2457863.958","sigma":"0.00021","label":"tp","title":"time of perihelion passage","name":"tp","units":"TDB"},{"sigma":"0.00022","value":"2370","units":"d","name":"per","label":"period","title":"sidereal orbital period"},{"sigma":"1.4e-08","value":"0.152","name":"n","units":"deg/d","label":"n","title":"mean motion"},{"sigma":"3.6e-07","value":"5.89","name":"ad","units":"au","title":"aphelion distance","label":"Q"}],"n_del_obs_used":null,"moid":"0.0732","n_dop_obs_used":null,"rms":"0.55","soln_date":"2025-05-01 10:45:38","producer":"Davide Farnocchia","epoch":"2457152.5","not_valid_before":null,"condition_code":"0","t_jup":"2.642","sb_used":"SB441-N16","cov_epoch":"2457152.5","not_valid_after":null,"data_arc":"6202","pe_used":"DE441","model_pars":[{"title":"non-grav. radial accel.","sigma":"9.413E-12","units":"au/d^2","name":"A1","desc":"non-gravitational radial acceleration parameter","n":1,"value":"1.385e-09","kind":"EST"},{"sigma":"2.06E-12","title":"non-grav. transverse accel.","kind":"EST","value":"1.464e-10","n":2,"desc":"non-gravitational transverse acceleration parameter","units":"au/d^2","name":"A2"},{"n":3,"name":"A3","units":"au/d^2","desc":"non-gravitational normal acceleration parameter","kind":"EST","value":"1.812e-10","title":"non-grav. normal accel.","sigma":"8.672E-12"},{"desc":"non-gravitational perihelion-maximum offset","name":"DT","units":"d","n":4,"value":"12.2","kind":"EST","title":"non-grav. perihelion offset","sigma":".2216"}],"moid_jup":"0.277","n_obs_used":8768,"comment":null},"phys_par":[{"name":"M1","units":null,"desc":"absolute magnitude of comet and coma (i.e. total)","notes":"2 parameter fit from 3039 observations, autocmod 3.0f","value":"16.0","title":"comet total magnitude","ref":"K233/5","sigma":"0.9"},{"name":"K1","units":null,"desc":"comet total magnitude slope parameter","notes":"autocmod 3.0f","value":"4.5","title":"comet total magnitude slope","sigma":null,"ref":"K233/5"},{"sigma":null,"ref":"Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264","title":"diameter","notes":null,"value":"1.6","desc":"effective body diameter","name":"diameter","units":"km"},{"sigma":null,"ref":"LCDB (Rev. 2023-October); Warner et al., 2009","title":"rotation period","value":"18.1","notes":"[Result based on less than full coverage, so that the period may be wrong by 30 percent or so.]  REFERENCE LIST:[Harmon, J.K.; Nolan, M.C; Howell, E.S.; Giorgini, J.D. (2010) CBET 2515.], [Belton, M.J.S.; Thomas, P.; Li, J.-Y.; Williams, J.; et al. (2013) Icarus 222, 595-609.]","desc":"body rotation period (synodic)","units":"h","name":"rot_per"}],"signature":{"source":"NASA/JPL Small-Body Database (SBDB) API","version":"1.3"},"object":{"kind":"cn","prefix":"P","pha":false,"orbit_class":{"name":"Jupiter-family Comet","code":"JFc"},"fullname":"103P/Hartley 2","orbit_id":"K233/5","des":"103P","spkid":"1000041","neo":true}}
